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Swaying-Image-Filter.lua
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Swaying-Image-Filter.lua
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obs = obslua
bit = require("bit")
source_def = {}
source_def.id = "swaying-image"
source_def.type = obs.OBS_SOURCE_TYPE_FILTER
source_def.output_flags = bit.bor(obs.OBS_SOURCE_VIDEO, obs.OBS_SOURCE_CUSTOM_DRAW)
source_def.get_name = function()
return "Sway"
end
function script_description()
return "This adds a new filter to OBS that makes a source pan back and forth. To use it, open any source's filter menu and find the \"Sway\" filter."
end
source_def.create = function(settings, source)
local inlineEffect = [[
uniform float4x4 ViewProj;
uniform texture2d image;
uniform float xOff;
uniform float yOff;
uniform float xMult;
uniform float yMult;
sampler_state def_sampler {
Filter = Linear;
AddressU = Border;
AddressV = Border;
BorderColor = 00000000;
};
struct VertInOut {
float4 pos : POSITION;
float2 uv : TEXCOORD0;
};
VertInOut VSDefault(VertInOut vert_in)
{
VertInOut vert_out;
vert_out.pos = mul(float4(vert_in.pos.xyz, 1.0), ViewProj);
vert_out.uv = vert_in.uv;
return vert_out;
}
float4 PSAddOffset(VertInOut vert_in) : TARGET
{
vert_in.uv.x = (vert_in.uv.x * xMult) - xOff;
vert_in.uv.y = (vert_in.uv.y * yMult) - yOff;
float4 rgba = image.Sample(def_sampler, vert_in.uv);// * float4(0, 1.0, 1.0, 1.0);
if (rgba.a > 0){
// Because OBS multiplies the rgb values by alpha every chance it gets.
rgba.rgb /= rgba.a;
}
return rgba;
}
technique Draw
{
pass
{
vertex_shader = VSDefault(vert_in);
pixel_shader = PSAddOffset(vert_in);
}
}
]]
local filter = {}
filter.context = source
filter.params = {}
-- Internal state
filter.xOff = 0
filter.yOff = 0
filter.cycle = 0
obs.obs_enter_graphics()
obs.gs_effect_destroy(filter.effect)
filter.effect = obs.gs_effect_create(inlineEffect, "offsetEffect", nil)
if filter.effect ~= nil then
filter.params.xOff = obs.gs_effect_get_param_by_name(filter.effect, 'xOff')
filter.params.yOff = obs.gs_effect_get_param_by_name(filter.effect, 'yOff')
filter.params.xMult = obs.gs_effect_get_param_by_name(filter.effect, 'xMult')
filter.params.yMult = obs.gs_effect_get_param_by_name(filter.effect, 'yMult')
end
obs.obs_leave_graphics()
set_render_size(filter)
source_def.update(filter, settings)
return filter
end
source_def.destroy = function(filter)
if filter.effect ~= nil then
obs.obs_enter_graphics()
obs.gs_effect_destroy(filter.effect)
obs.obs_leave_graphics()
end
end
function set_render_size(filter)
target = obs.obs_filter_get_target(filter.context)
local width, height
if target == nil then
width = 0
height = 0
else
width = obs.obs_source_get_base_width(target)
height = obs.obs_source_get_base_height(target)
end
filter.image_width = width
filter.image_height = height
filter.width = width
filter.height = height
if filter.direction == 0 then
filter.width = math.max(width + (filter.range or 0), 0)
else
filter.height = math.max(height + (filter.range or 0), 0)
end
end
source_def.video_render = function(filter, effect)
obs.obs_source_process_filter_begin(filter.context, obs.GS_RGBA, obs.OBS_NO_DIRECT_RENDERING)
obs.gs_effect_set_float(filter.params.xOff, filter.xOff / filter.image_width)
obs.gs_effect_set_float(filter.params.yOff, filter.yOff / filter.image_height)
obs.gs_effect_set_float(filter.params.xMult, filter.width / filter.image_width)
obs.gs_effect_set_float(filter.params.yMult, filter.height / filter.image_height)
obs.obs_source_process_filter_end(filter.context, filter.effect, filter.width, filter.height)
end
source_def.video_tick = function(filter, deltaTime)
set_render_size(filter)
local effectivePeriod = filter.period
if (effectivePeriod or 0) == 0 then effectivePeriod = 1 end
filter.cycle = filter.cycle + deltaTime
if filter.cycle > effectivePeriod then
filter.cycle = filter.cycle - effectivePeriod
end
local t = filter.cycle / effectivePeriod * 2 * math.pi
filter.xOff = 0
filter.yOff = 0
filter[(filter.direction == 0) and "xOff" or "yOff"] = (math.sin(t) + 1) / 2 * (filter.range or 0)
end
----------------------
source_def.get_properties = function(settings)
props = obs.obs_properties_create()
obs.obs_properties_add_float(props, "period", "Period", 0.5, 10000, 1)
local list = obs.obs_properties_add_list(props, "direction", "Direction", obs.OBS_COMBO_TYPE_LIST, obs.OBS_COMBO_FORMAT_INT)
obs.obs_property_list_add_int(list, "Horizontal", 0)
obs.obs_property_list_add_int(list, "Vertical", 1)
obs.obs_properties_add_int(props, "range", "Range (can be negative)", -10000, 10000, 10)
return props
end
source_def.get_defaults = function(settings)
obs.obs_data_set_default_double(settings, "period", 5)
obs.obs_data_set_default_int(settings, "direction", 0)
obs.obs_data_set_default_int(settings, "range", 100)
end
source_def.update = function(filter, settings)
filter.period = obs.obs_data_get_double(settings, "period")
filter.direction = obs.obs_data_get_int(settings, "direction")
filter.range = obs.obs_data_get_int(settings, "range")
set_render_size(filter)
end
-----------------------
source_def.get_width = function(filter)
return filter.width
end
source_def.get_height = function(filter)
return filter.height
end
obs.obs_register_source(source_def)